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DAT files are files with an extension that isn't associated with a specific application or program and can be almost any type of file including video, media or text. Gaining access to the DAT files can be particularly important for businesses that receive email attachments or file shares with the DAT extension. If the DAT file you're trying to open is text, you can convert the file into text in the Microsoft Excel program by first saving it as a CSV file.

1. Right-click the DAT file on your PC and click "Open."

2. Click "Select a program from a list of installed programs" and click "OK".

3. Click "Microsoft Excel" from the list of programs on your computer. Uncheck "Always use the selected program to open this kind of file" if you're unsure if the DAT is text-based, as you may want to try opening with a different program if it doesn't convert properly in Excel. Click "OK."

About the Author

Casey Anderson is a part-time writer and full-time marketer who has been published on websites such as Opposing Views and Salon. She has also contributed articles to local Detroit Magazines, Strut and Orbit. A Wayne State University Master of Business Administration graduate, Nation began her writing career in 2001 and has extensive experience in business and research writing.